drivers/ata/libata-acpi.c

   1 /*
   2  * libata-acpi.c
   3  * Provides ACPI support for PATA/SATA.
   4  *
   5  * Copyright (C) 2006 Intel Corp.
   6  * Copyright (C) 2006 Randy Dunlap
   7  */
   8
   9 #include <linux/ata.h>
  10 #include <linux/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/errno.h>
  13 #include <linux/kernel.h>
  14 #include <linux/acpi.h>
  15 #include <linux/libata.h>
  16 #include <linux/pci.h>
  17 #include "libata.h"
  18
  19 #include <acpi/acpi_bus.h>
  20 #include <acpi/acnames.h>
  21 #include <acpi/acnamesp.h>
  22 #include <acpi/acparser.h>
  23 #include <acpi/acexcep.h>
  24 #include <acpi/acmacros.h>
  25 #include <acpi/actypes.h>
  26
  27 #define SATA_ROOT_PORT(x)       (((x) >> 16) & 0xffff)
  28 #define SATA_PORT_NUMBER(x)     ((x) & 0xffff)  /* or NO_PORT_MULT */
  29 #define NO_PORT_MULT            0xffff
  30 #define SATA_ADR_RSVD           0xffffffff
  31
  32 #define REGS_PER_GTF            7
  33 struct taskfile_array {
  34         u8      tfa[REGS_PER_GTF];      /* regs. 0x1f1 - 0x1f7 */
  35 };
  36
  37 /*
  38  *      Helper - belongs in the PCI layer somewhere eventually
  39  */
  40 static int is_pci_dev(struct device *dev)
  41 {
  42         return (dev->bus == &pci_bus_type);
  43 }
  44
  45 /**
  46  * sata_get_dev_handle - finds acpi_handle and PCI device.function
  47  * @dev: device to locate
  48  * @handle: returned acpi_handle for @dev
  49  * @pcidevfn: return PCI device.func for @dev
  50  *
  51  * This function is somewhat SATA-specific.  Or at least the
  52  * PATA & SATA versions of this function are different,
  53  * so it's not entirely generic code.
  54  *
  55  * Returns 0 on success, <0 on error.
  56  */
  57 static int sata_get_dev_handle(struct device *dev, acpi_handle *handle,
  58                                         acpi_integer *pcidevfn)
  59 {
  60         struct pci_dev  *pci_dev;
  61         acpi_integer    addr;
  62
  63         if (!is_pci_dev(dev))
  64                 return -ENODEV;
  65
  66         pci_dev = to_pci_dev(dev);      /* NOTE: PCI-specific */
  67         /* Please refer to the ACPI spec for the syntax of _ADR. */
  68         addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
  69         *pcidevfn = addr;
  70         *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
  71         if (!*handle)
  72                 return -ENODEV;
  73         return 0;
  74 }
  75
  76 /**
  77  * pata_get_dev_handle - finds acpi_handle and PCI device.function
  78  * @dev: device to locate
  79  * @handle: returned acpi_handle for @dev
  80  * @pcidevfn: return PCI device.func for @dev
  81  *
  82  * The PATA and SATA versions of this function are different.
  83  *
  84  * Returns 0 on success, <0 on error.
  85  */
  86 static int pata_get_dev_handle(struct device *dev, acpi_handle *handle,
  87                                 acpi_integer *pcidevfn)
  88 {
  89         unsigned int bus, devnum, func;
  90         acpi_integer addr;
  91         acpi_handle dev_handle, parent_handle;
  92         struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
  93                                         .pointer = NULL};
  94         acpi_status status;
  95         struct acpi_device_info *dinfo = NULL;
  96         int ret = -ENODEV;
  97         struct pci_dev *pdev;
  98
  99         if (!is_pci_dev(dev))
 100                 return -ENODEV;
 101
 102         pdev = to_pci_dev(dev);
 103
 104         bus = pdev->bus->number;
 105         devnum = PCI_SLOT(pdev->devfn);
 106         func = PCI_FUNC(pdev->devfn);
 107
 108         dev_handle = DEVICE_ACPI_HANDLE(dev);
 109         parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
 110
 111         status = acpi_get_object_info(parent_handle, &buffer);
 112         if (ACPI_FAILURE(status))
 113                 goto err;
 114
 115         dinfo = buffer.pointer;
 116         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 117             dinfo->address == bus) {
 118                 /* ACPI spec for _ADR for PCI bus: */
 119                 addr = (acpi_integer)(devnum << 16 | func);
 120                 *pcidevfn = addr;
 121                 *handle = dev_handle;
 122         } else {
 123                 goto err;
 124         }
 125
 126         if (!*handle)
 127                 goto err;
 128         ret = 0;
 129 err:
 130         kfree(dinfo);
 131         return ret;
 132 }
 133
 134 struct walk_info {              /* can be trimmed some */
 135         struct device   *dev;
 136         struct acpi_device *adev;
 137         acpi_handle     handle;
 138         acpi_integer    pcidevfn;
 139         unsigned int    drivenum;
 140         acpi_handle     obj_handle;
 141         struct ata_port *ataport;
 142         struct ata_device *atadev;
 143         u32             sata_adr;
 144         int             status;
 145         char            basepath[ACPI_PATHNAME_MAX];
 146         int             basepath_len;
 147 };
 148
 149 static acpi_status get_devices(acpi_handle handle,
 150                                 u32 level, void *context, void **return_value)
 151 {
 152         acpi_status             status;
 153         struct walk_info        *winfo = context;
 154         struct acpi_buffer      namebuf = {ACPI_ALLOCATE_BUFFER, NULL};
 155         char                    *pathname;
 156         struct acpi_buffer      buffer;
 157         struct acpi_device_info *dinfo;
 158
 159         status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &namebuf);
 160         if (status)
 161                 goto ret;
 162         pathname = namebuf.pointer;
 163
 164         buffer.length = ACPI_ALLOCATE_BUFFER;
 165         buffer.pointer = NULL;
 166         status = acpi_get_object_info(handle, &buffer);
 167         if (ACPI_FAILURE(status))
 168                 goto out2;
 169
 170         dinfo = buffer.pointer;
 171
 172         /* find full device path name for pcidevfn */
 173         if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
 174             dinfo->address == winfo->pcidevfn) {
 175                 if (ata_msg_probe(winfo->ataport))
 176                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 177                                 ":%s: matches pcidevfn (0x%llx)\n",
 178                                 pathname, winfo->pcidevfn);
 179                 strlcpy(winfo->basepath, pathname,
 180                         sizeof(winfo->basepath));
 181                 winfo->basepath_len = strlen(pathname);
 182                 goto out;
 183         }
 184
 185         /* if basepath is not yet known, ignore this object */
 186         if (!winfo->basepath_len)
 187                 goto out;
 188
 189         /* if this object is in scope of basepath, maybe use it */
 190         if (strncmp(pathname, winfo->basepath,
 191             winfo->basepath_len) == 0) {
 192                 if (!(dinfo->valid & ACPI_VALID_ADR))
 193                         goto out;
 194                 if (ata_msg_probe(winfo->ataport))
 195                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 196                                 "GOT ONE: (%s) root_port = 0x%llx,"
 197                                 " port_num = 0x%llx\n", pathname,
 198                                 SATA_ROOT_PORT(dinfo->address),
 199                                 SATA_PORT_NUMBER(dinfo->address));
 200                 /* heuristics: */
 201                 if (SATA_PORT_NUMBER(dinfo->address) != NO_PORT_MULT)
 202                         if (ata_msg_probe(winfo->ataport))
 203                                 ata_dev_printk(winfo->atadev,
 204                                         KERN_DEBUG, "warning: don't"
 205                                         " know how to handle SATA port"
 206                                         " multiplier\n");
 207                 if (SATA_ROOT_PORT(dinfo->address) ==
 208                         winfo->ataport->port_no &&
 209                     SATA_PORT_NUMBER(dinfo->address) == NO_PORT_MULT) {
 210                         if (ata_msg_probe(winfo->ataport))
 211                                 ata_dev_printk(winfo->atadev,
 212                                         KERN_DEBUG,
 213                                         "THIS ^^^^^ is the requested"
 214                                         " SATA drive (handle = 0x%p)\n",
 215                                         handle);
 216                         winfo->sata_adr = dinfo->address;
 217                         winfo->obj_handle = handle;
 218                 }
 219         }
 220 out:
 221         kfree(dinfo);
 222 out2:
 223         kfree(pathname);
 224
 225 ret:
 226         return status;
 227 }
 228
 229 /* Get the SATA drive _ADR object. */
 230 static int get_sata_adr(struct device *dev, acpi_handle handle,
 231                         acpi_integer pcidevfn, unsigned int drive,
 232                         struct ata_port *ap,
 233                         struct ata_device *atadev, u32 *dev_adr)
 234 {
 235         acpi_status     status;
 236         struct walk_info *winfo;
 237         int             err = -ENOMEM;
 238
 239         winfo = kzalloc(sizeof(struct walk_info), GFP_KERNEL);
 240         if (!winfo)
 241                 goto out;
 242
 243         winfo->dev = dev;
 244         winfo->atadev = atadev;
 245         winfo->ataport = ap;
 246         if (acpi_bus_get_device(handle, &winfo->adev) < 0)
 247                 if (ata_msg_probe(ap))
 248                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 249                                 "acpi_bus_get_device failed\n");
 250         winfo->handle = handle;
 251         winfo->pcidevfn = pcidevfn;
 252         winfo->drivenum = drive;
 253
 254         status = acpi_get_devices(NULL, get_devices, winfo, NULL);
 255         if (ACPI_FAILURE(status)) {
 256                 if (ata_msg_probe(ap))
 257                         ata_dev_printk(winfo->atadev, KERN_DEBUG,
 258                                 "%s: acpi_get_devices failed\n",
 259                                 __FUNCTION__);
 260                 err = -ENODEV;
 261         } else {
 262                 *dev_adr = winfo->sata_adr;
 263                 atadev->obj_handle = winfo->obj_handle;
 264                 err = 0;
 265         }
 266         kfree(winfo);
 267 out:
 268         return err;
 269 }
 270
 271 /**
 272  * do_drive_get_GTF - get the drive bootup default taskfile settings
 273  * @dev: target ATA device
 274  * @gtf_length: number of bytes of _GTF data returned at @gtf_address
 275  * @gtf_address: buffer containing _GTF taskfile arrays
 276  *
 277  * This applies to both PATA and SATA drives.
 278  *
 279  * The _GTF method has no input parameters.
 280  * It returns a variable number of register set values (registers
 281  * hex 1F1..1F7, taskfiles).
 282  * The <variable number> is not known in advance, so have ACPI-CA
 283  * allocate the buffer as needed and return it, then free it later.
 284  *
 285  * The returned @gtf_length and @gtf_address are only valid if the
 286  * function return value is 0.
 287  */
 288 static int do_drive_get_GTF(struct ata_device *dev, unsigned int *gtf_length,
 289                             unsigned long *gtf_address, unsigned long *obj_loc)
 290 {
 291         struct ata_port *ap = dev->ap;
 292         acpi_status status;
 293         acpi_handle dev_handle = NULL;
 294         acpi_handle chan_handle, drive_handle;
 295         acpi_integer pcidevfn = 0;
 296         u32 dev_adr;
 297         struct acpi_buffer output;
 298         union acpi_object *out_obj;
 299         struct device *gdev = ap->host->dev;
 300         int err = -ENODEV;
 301
 302         *gtf_length = 0;
 303         *gtf_address = 0UL;
 304         *obj_loc = 0UL;
 305
 306         if (libata_noacpi)
 307                 return 0;
 308
 309         if (ata_msg_probe(ap))
 310                 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
 311                                __FUNCTION__, ap->port_no);
 312
 313         if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED)) {
 314                 if (ata_msg_probe(ap))
 315                         ata_dev_printk(dev, KERN_DEBUG, "%s: ERR: "
 316                                 "ata_dev_present: %d, PORT_DISABLED: %lu\n",
 317                                 __FUNCTION__, ata_dev_enabled(dev),
 318                                 ap->flags & ATA_FLAG_DISABLED);
 319                 goto out;
 320         }
 321
 322         /* Don't continue if device has no _ADR method.
 323          * _GTF is intended for known motherboard devices. */
 324         if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
 325                 err = pata_get_dev_handle(gdev, &dev_handle, &pcidevfn);
 326                 if (err < 0) {
 327                         if (ata_msg_probe(ap))
 328                                 ata_dev_printk(dev, KERN_DEBUG,
 329                                         "%s: pata_get_dev_handle failed (%d)\n",
 330                                         __FUNCTION__, err);
 331                         goto out;
 332                 }
 333         } else {
 334                 err = sata_get_dev_handle(gdev, &dev_handle, &pcidevfn);
 335                 if (err < 0) {
 336                         if (ata_msg_probe(ap))
 337                                 ata_dev_printk(dev, KERN_DEBUG,
 338                                         "%s: sata_get_dev_handle failed (%d\n",
 339                                         __FUNCTION__, err);
 340                         goto out;
 341                 }
 342         }
 343
 344         /* Get this drive's _ADR info. if not already known. */
 345         if (!dev->obj_handle) {
 346                 if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
 347                         /* get child objects of dev_handle == channel objects,
 348                          * + _their_ children == drive objects */
 349                         /* channel is ap->port_no */
 350                         chan_handle = acpi_get_child(dev_handle,
 351                                                 ap->port_no);
 352                         if (ata_msg_probe(ap))
 353                                 ata_dev_printk(dev, KERN_DEBUG,
 354                                         "%s: chan adr=%d: chan_handle=0x%p\n",
 355                                         __FUNCTION__, ap->port_no,
 356                                         chan_handle);
 357                         if (!chan_handle) {
 358                                 err = -ENODEV;
 359                                 goto out;
 360                         }
 361                         /* TBD: could also check ACPI object VALID bits */
 362                         drive_handle = acpi_get_child(chan_handle, dev->devno);
 363                         if (!drive_handle) {
 364                                 err = -ENODEV;
 365                                 goto out;
 366                         }
 367                         dev_adr = dev->devno;
 368                         dev->obj_handle = drive_handle;
 369                 } else {        /* for SATA mode */
 370                         dev_adr = SATA_ADR_RSVD;
 371                         err = get_sata_adr(gdev, dev_handle, pcidevfn, 0,
 372                                         ap, dev, &dev_adr);
 373                 }
 374                 if (err < 0 || dev_adr == SATA_ADR_RSVD ||
 375                     !dev->obj_handle) {
 376                         if (ata_msg_probe(ap))
 377                                 ata_dev_printk(dev, KERN_DEBUG,
 378                                         "%s: get_sata/pata_adr failed: "
 379                                         "err=%d, dev_adr=%u, obj_handle=0x%p\n",
 380                                         __FUNCTION__, err, dev_adr,
 381                                         dev->obj_handle);
 382                         goto out;
 383                 }
 384         }
 385
 386         /* Setting up output buffer */
 387         output.length = ACPI_ALLOCATE_BUFFER;
 388         output.pointer = NULL;  /* ACPI-CA sets this; save/free it later */
 389
 390         /* _GTF has no input parameters */
 391         err = -EIO;
 392         status = acpi_evaluate_object(dev->obj_handle, "_GTF",
 393                                         NULL, &output);
 394         if (ACPI_FAILURE(status)) {
 395                 if (ata_msg_probe(ap))
 396                         ata_dev_printk(dev, KERN_DEBUG,
 397                                 "%s: Run _GTF error: status = 0x%x\n",
 398                                 __FUNCTION__, status);
 399                 goto out;
 400         }
 401
 402         if (!output.length || !output.pointer) {
 403                 if (ata_msg_probe(ap))
 404                         ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
 405                                 "length or ptr is NULL (0x%llx, 0x%p)\n",
 406                                 __FUNCTION__,
 407                                 (unsigned long long)output.length,
 408                                 output.pointer);
 409                 kfree(output.pointer);
 410                 goto out;
 411         }
 412
 413         out_obj = output.pointer;
 414         if (out_obj->type != ACPI_TYPE_BUFFER) {
 415                 kfree(output.pointer);
 416                 if (ata_msg_probe(ap))
 417                         ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
 418                                 "error: expected object type of "
 419                                 " ACPI_TYPE_BUFFER, got 0x%x\n",
 420                                 __FUNCTION__, out_obj->type);
 421                 err = -ENOENT;
 422                 goto out;
 423         }
 424
 425         if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
 426             out_obj->buffer.length % REGS_PER_GTF) {
 427                 if (ata_msg_drv(ap))
 428                         ata_dev_printk(dev, KERN_ERR,
 429                                 "%s: unexpected GTF length (%d) or addr (0x%p)\n",
 430                                 __FUNCTION__, out_obj->buffer.length,
 431                                 out_obj->buffer.pointer);
 432                 err = -ENOENT;
 433                 goto out;
 434         }
 435
 436         *gtf_length = out_obj->buffer.length;
 437         *gtf_address = (unsigned long)out_obj->buffer.pointer;
 438         *obj_loc = (unsigned long)out_obj;
 439         if (ata_msg_probe(ap))
 440                 ata_dev_printk(dev, KERN_DEBUG, "%s: returning "
 441                         "gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
 442                         __FUNCTION__, *gtf_length, *gtf_address, *obj_loc);
 443         err = 0;
 444 out:
 445         return err;
 446 }
 447
 448 /**
 449  * taskfile_load_raw - send taskfile registers to host controller
 450  * @dev: target ATA device
 451  * @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
 452  *
 453  * Outputs ATA taskfile to standard ATA host controller using MMIO
 454  * or PIO as indicated by the ATA_FLAG_MMIO flag.
 455  * Writes the control, feature, nsect, lbal, lbam, and lbah registers.
 456  * Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
 457  * hob_lbal, hob_lbam, and hob_lbah.
 458  *
 459  * This function waits for idle (!BUSY and !DRQ) after writing
 460  * registers.  If the control register has a new value, this
 461  * function also waits for idle after writing control and before
 462  * writing the remaining registers.
 463  *
 464  * LOCKING: TBD:
 465  * Inherited from caller.
 466  */
 467 static void taskfile_load_raw(struct ata_device *dev,
 468                               const struct taskfile_array *gtf)
 469 {
 470         struct ata_port *ap = dev->ap;
 471         struct ata_taskfile tf;
 472         unsigned int err;
 473
 474         if (ata_msg_probe(ap))
 475                 ata_dev_printk(dev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
 476                         "%02x %02x %02x %02x %02x %02x %02x\n",
 477                         __FUNCTION__,
 478                         gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
 479                         gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
 480
 481         if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
 482             && (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
 483             && (gtf->tfa[6] == 0))
 484                 return;
 485
 486         ata_tf_init(dev, &tf);
 487
 488         /* convert gtf to tf */
 489         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
 490         tf.protocol = ATA_PROT_NODATA;
 491         tf.feature = gtf->tfa[0];       /* 0x1f1 */
 492         tf.nsect   = gtf->tfa[1];       /* 0x1f2 */
 493         tf.lbal    = gtf->tfa[2];       /* 0x1f3 */
 494         tf.lbam    = gtf->tfa[3];       /* 0x1f4 */
 495         tf.lbah    = gtf->tfa[4];       /* 0x1f5 */
 496         tf.device  = gtf->tfa[5];       /* 0x1f6 */
 497         tf.command = gtf->tfa[6];       /* 0x1f7 */
 498
 499         err = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
 500         if (err && ata_msg_probe(ap))
 501                 ata_dev_printk(dev, KERN_ERR,
 502                         "%s: ata_exec_internal failed: %u\n",
 503                         __FUNCTION__, err);
 504 }
 505
 506 /**
 507  * do_drive_set_taskfiles - write the drive taskfile settings from _GTF
 508  * @dev: target ATA device
 509  * @gtf_length: total number of bytes of _GTF taskfiles
 510  * @gtf_address: location of _GTF taskfile arrays
 511  *
 512  * This applies to both PATA and SATA drives.
 513  *
 514  * Write {gtf_address, length gtf_length} in groups of
 515  * REGS_PER_GTF bytes.
 516  */
 517 static int do_drive_set_taskfiles(struct ata_device *dev,
 518                                   unsigned int gtf_length,
 519                                   unsigned long gtf_address)
 520 {
 521         struct ata_port *ap = dev->ap;
 522         int err = -ENODEV;
 523         int gtf_count = gtf_length / REGS_PER_GTF;
 524         int ix;
 525         struct taskfile_array   *gtf;
 526
 527         if (ata_msg_probe(ap))
 528                 ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
 529                                __FUNCTION__, ap->port_no);
 530
 531         if (libata_noacpi || !(ap->flags & ATA_FLAG_ACPI_SATA))
 532                 return 0;
 533
 534         if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED))
 535                 goto out;
 536         if (!gtf_count)         /* shouldn't be here */
 537                 goto out;
 538
 539         if (gtf_length % REGS_PER_GTF) {
 540                 if (ata_msg_drv(ap))
 541                         ata_dev_printk(dev, KERN_ERR,
 542                                 "%s: unexpected GTF length (%d)\n",
 543                                 __FUNCTION__, gtf_length);
 544                 goto out;
 545         }
 546
 547         for (ix = 0; ix < gtf_count; ix++) {
 548                 gtf = (struct taskfile_array *)
 549                         (gtf_address + ix * REGS_PER_GTF);
 550
 551                 /* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
 552                 taskfile_load_raw(dev, gtf);
 553         }
 554
 555         err = 0;
 556 out:
 557         return err;
 558 }
 559
 560 /**
 561  * ata_acpi_exec_tfs - get then write drive taskfile settings
 562  * @ap: the ata_port for the drive
 563  *
 564  * This applies to both PATA and SATA drives.
 565  */
 566 int ata_acpi_exec_tfs(struct ata_port *ap)
 567 {
 568         int ix;
 569         int ret = 0;
 570         unsigned int gtf_length;
 571         unsigned long gtf_address;
 572         unsigned long obj_loc;
 573
 574         if (libata_noacpi)
 575                 return 0;
 576         /*
 577          * TBD - implement PATA support.  For now,
 578          * we should not run GTF on PATA devices since some
 579          * PATA require execution of GTM/STM before GTF.
 580          */
 581         if (!(ap->flags & ATA_FLAG_ACPI_SATA))
 582                 return 0;
 583
 584         for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
 585                 struct ata_device *dev = &ap->device[ix];
 586
 587                 if (!ata_dev_enabled(dev))
 588                         continue;
 589
 590                 ret = do_drive_get_GTF(dev, &gtf_length, &gtf_address,
 591                                        &obj_loc);
 592                 if (ret < 0) {
 593                         if (ata_msg_probe(ap))
 594                                 ata_port_printk(ap, KERN_DEBUG,
 595                                         "%s: get_GTF error (%d)\n",
 596                                         __FUNCTION__, ret);
 597                         break;
 598                 }
 599
 600                 ret = do_drive_set_taskfiles(dev, gtf_length, gtf_address);
 601                 kfree((void *)obj_loc);
 602                 if (ret < 0) {
 603                         if (ata_msg_probe(ap))
 604                                 ata_port_printk(ap, KERN_DEBUG,
 605                                         "%s: set_taskfiles error (%d)\n",
 606                                         __FUNCTION__, ret);
 607                         break;
 608                 }
 609         }
 610
 611         return ret;
 612 }
 613
 614 /**
 615  * ata_acpi_push_id - send Identify data to drive
 616  * @dev: target ATA device
 617  *
 618  * _SDD ACPI object: for SATA mode only
 619  * Must be after Identify (Packet) Device -- uses its data
 620  * ATM this function never returns a failure.  It is an optional
 621  * method and if it fails for whatever reason, we should still
 622  * just keep going.
 623  */
 624 int ata_acpi_push_id(struct ata_device *dev)
 625 {
 626         struct ata_port *ap = dev->ap;
 627         acpi_handle handle;
 628         acpi_integer pcidevfn;
 629         int err;
 630         struct device *gdev = ap->host->dev;
 631         u32 dev_adr;
 632         acpi_status status;
 633         struct acpi_object_list input;
 634         union acpi_object in_params[1];
 635
 636         if (libata_noacpi)
 637                 return 0;
 638
 639         if (ata_msg_probe(ap))
 640                 ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
 641                                __FUNCTION__, dev->devno, ap->port_no);
 642
 643         /* Don't continue if not a SATA device. */
 644         if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
 645                 if (ata_msg_probe(ap))
 646                         ata_dev_printk(dev, KERN_DEBUG,
 647                                 "%s: Not a SATA device\n", __FUNCTION__);
 648                 goto out;
 649         }
 650
 651         /* Don't continue if device has no _ADR method.
 652          * _SDD is intended for known motherboard devices. */
 653         err = sata_get_dev_handle(gdev, &handle, &pcidevfn);
 654         if (err < 0) {
 655                 if (ata_msg_probe(ap))
 656                         ata_dev_printk(dev, KERN_DEBUG,
 657                                 "%s: sata_get_dev_handle failed (%d\n",
 658                                 __FUNCTION__, err);
 659                 goto out;
 660         }
 661
 662         /* Get this drive's _ADR info, if not already known */
 663         if (!dev->obj_handle) {
 664                 dev_adr = SATA_ADR_RSVD;
 665                 err = get_sata_adr(gdev, handle, pcidevfn, dev->devno, ap, dev,
 666                                         &dev_adr);
 667                 if (err < 0 || dev_adr == SATA_ADR_RSVD ||
 668                         !dev->obj_handle) {
 669                         if (ata_msg_probe(ap))
 670                                 ata_dev_printk(dev, KERN_DEBUG,
 671                                         "%s: get_sata_adr failed: "
 672                                         "err=%d, dev_adr=%u, obj_handle=0x%p\n",
 673                                         __FUNCTION__, err, dev_adr,
 674                                         dev->obj_handle);
 675                         goto out;
 676                 }
 677         }
 678
 679         /* Give the drive Identify data to the drive via the _SDD method */
 680         /* _SDD: set up input parameters */
 681         input.count = 1;
 682         input.pointer = in_params;
 683         in_params[0].type = ACPI_TYPE_BUFFER;
 684         in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
 685         in_params[0].buffer.pointer = (u8 *)dev->id;
 686         /* Output buffer: _SDD has no output */
 687
 688         /* It's OK for _SDD to be missing too. */
 689         swap_buf_le16(dev->id, ATA_ID_WORDS);
 690         status = acpi_evaluate_object(dev->obj_handle, "_SDD", &input, NULL);
 691         swap_buf_le16(dev->id, ATA_ID_WORDS);
 692
 693         err = ACPI_FAILURE(status) ? -EIO : 0;
 694         if (err < 0) {
 695                 if (ata_msg_probe(ap))
 696                         ata_dev_printk(dev, KERN_DEBUG,
 697                                        "%s _SDD error: status = 0x%x\n",
 698                                        __FUNCTION__, status);
 699         }
 700
 701         /* always return success */
 702 out:
 703         return 0;
 704 }
 705
 706